<?php
if (!defined('IN_DZZ')) {
    exit('Access Denied');
}

class helper_security {

    public static function removeXSS($val) {
        $val = preg_replace('/([\x00-\x08][\x0b-\x0c][\x0e-\x20])/', '', $val);
        $search = 'abcdefghijklmnopqrstuvwxyz';
        $search .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
        $search .= '1234567890!@#$%^&*()';
        $search .= '~`";:?+/={}[]-_|\'\\';
        for ($i = 0; $i < strlen($search); $i++) {
            $val = preg_replace('/(&#[x|X]0{0,8}' . dechex(ord($search[$i])) . ';?)/i', $search[$i], $val);
            $val = preg_replace('/(&#0{0,8}' . ord($search[$i]) . ';?)/', $search[$i], $val);
        }

        $ra1 = array('javascript', 'vbscript', 'expression', 'applet', 'meta', 'xml', 'blink', 'link', 'style', 'script', 'embed', 'object', 'iframe', 'frame', 'frameset', 'ilayer', 'layer', 'bgsound', 'title', 'base');
        $ra2 = array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload');
        $ra = array_merge($ra1, $ra2);
        $found = true;
        while ($found == true) {
            $val_before = $val;
            for ($i = 0; $i < sizeof($ra); $i++) {
                $pattern = '/';
                for ($j = 0; $j < strlen($ra[$i]); $j++) {
                    if ($j > 0) {
                        $pattern .= '(';
                        $pattern .= '(&#[x|X]0{0,8}([9][a][b]);?)?';
                        $pattern .= '|(&#0{0,8}([9][10][13]);?)?';
                        $pattern .= ')?';
                    }
                    $pattern .= $ra[$i][$j];
                }
                $pattern .= '/i';
                $replacement = substr($ra[$i], 0, 2) . '' . substr($ra[$i], 2);
                $val = preg_replace($pattern, $replacement, $val);
                if ($val_before == $val) {
                    $found = false;
                }
            }
        }
        return $val;
    }

    public static function checkhtml($html) {

        preg_match_all("/\<([^\<]+)\>/is", $html, $ms);

        $searchs[] = '<';
        $replaces[] = '&lt;';
        $searchs[] = '>';
        $replaces[] = '&gt;';

        if ($ms[1]) {
            $allowtags = 'img|a|font|div|table|tbody|caption|tr|td|th|br|p|b|strong|i|u|em|span|ol|ul|li|blockquote|pre|hr|embed|h1|h2|h3|h4|h5|h6|iframe';
            $ms[1] = array_unique($ms[1]);
            foreach ($ms[1] as $value) {
                $searchs[] = "&lt;" . $value . "&gt;";

                $value = str_replace('&amp;', '_uch_tmp_str_', $value);
                $value = dhtmlspecialchars($value);
                $value = str_replace('_uch_tmp_str_', '&amp;', $value);


                $value = str_replace(array('\\', '/*'), array('.', '/.'), $value);
                $skipkeys = array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate',
                    'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange',
                    'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick',
                    'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate',
                    'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete',
                    'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel',
                    'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart',
                    'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop',
                    'onsubmit', 'onunload', 'javascript:;', 'javascript', 'script', 'eval', 'behaviour', 'expression');
                $skipstr = implode('|', $skipkeys);
                $value = preg_replace(array("/($skipstr)/i"), '.', $value);
                if (!preg_match("/^[\/|\s]?($allowtags)(\s+|$)/is", $value) && !preg_match("/^(br|hr)?(\s+|\/|$)/is", $value)) {
                    $value = '';
                }
                $replaces[] = empty($value) ? '' : "<" . str_replace('&quot;', '"', $value) . ">";
            }
        }
        $html = str_replace($searchs, $replaces, $html);

        return getstr($html, 0, 0, 0, 0, 1);
    }
    /*public function htmlpurifier($html){
        require_once DZZ_ROOT.'./core/class/htmlpurifier/HTMLPurifier.auto.php';
        $config = HTMLPurifier_Config::createDefault();
        $purifier = new HTMLPurifier($config);
        return  $purifier->purify($html);
    }*/
}

?>